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jeremybenn |
/* ICC_ColorSpace.java -- the canonical color space implementation
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Copyright (C) 2000, 2002, 2004 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.color;
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import gnu.java.awt.color.CieXyzConverter;
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import gnu.java.awt.color.ClutProfileConverter;
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import gnu.java.awt.color.ColorSpaceConverter;
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import gnu.java.awt.color.GrayProfileConverter;
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import gnu.java.awt.color.GrayScaleConverter;
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import gnu.java.awt.color.LinearRGBConverter;
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import gnu.java.awt.color.PyccConverter;
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import gnu.java.awt.color.RgbProfileConverter;
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import gnu.java.awt.color.SrgbConverter;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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/**
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* ICC_ColorSpace - an implementation of ColorSpace
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*
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* While an ICC_Profile class abstracts the data in an ICC profile file
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* an ICC_ColorSpace performs the color space conversions defined by
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* an ICC_Profile instance.
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*
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* Typically, an ICC_Profile will either be created using getInstance,
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* either from the built-in colorspaces, or from an ICC profile file.
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* Then a ICC_Colorspace will be used to perform transforms from the
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* device colorspace to and from the profile color space.
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*
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* The PCS used by ColorSpace is CIE XYZ relative a D50 white point.
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* (Profiles using a CIE Lab PCS will have their input and output converted
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* to D50 CIE XYZ accordingly.
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*
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* Note that a valid profile may not contain transforms in both directions,
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* in which case the output may be undefined.
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* All built-in colorspaces have bidirectional transforms, but developers
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* using an ICC profile file may want to check the profile class using
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* the ICC_Profile.getProfileClass() method. Input class profiles are
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* guaranteed to have transforms to the PCS, output class profiles are
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* guaranteed to have transforms from the PCS to device space.
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*
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* @author Sven de Marothy
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* @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
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* @since 1.2
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*/
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public class ICC_ColorSpace extends ColorSpace
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{
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/**
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* Compatible with JDK 1.2+.
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*/
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private static final long serialVersionUID = 3455889114070431483L;
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/**
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* @serial
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*/
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private ICC_Profile thisProfile;
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/**
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* @serial
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*/
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private float[] minVal;
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/**
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* @serial
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*/
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private float[] maxVal;
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/**
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* @serial
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*/
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private float[] diffMinMax;
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/**
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* @serial
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*/
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private float[] invDiffMinMax;
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/**
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* @serial
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*/
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private boolean needScaleInit;
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/**
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* Tells us if the PCS is CIE LAB (must be CIEXYZ otherwise)
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*/
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private transient int type;
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private transient int nComponents;
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private transient ColorSpaceConverter converter;
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/**
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* Constructs a new ICC_ColorSpace from an ICC_Profile object.
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*
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* @exception IllegalArgumentException If profile is inappropriate for
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* representing a ColorSpace.
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*/
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public ICC_ColorSpace(ICC_Profile profile)
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{
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super(profile.getColorSpaceType(), profile.getNumComponents());
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converter = getConverter(profile);
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thisProfile = profile;
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nComponents = profile.getNumComponents();
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type = profile.getColorSpaceType();
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makeArrays();
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}
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/**
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* Return the profile
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*/
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public ICC_Profile getProfile()
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{
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return thisProfile;
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}
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/**
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* Transforms a color value assumed to be in this ColorSpace into a value in
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* the default CS_sRGB color space.
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*
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* @exception ArrayIndexOutOfBoundsException If array length is not at least
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* the number of components in this ColorSpace.
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*/
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public float[] toRGB(float[] colorvalue)
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{
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return converter.toRGB(colorvalue);
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}
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/**
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* Transforms a color value assumed to be in the default CS_sRGB color space
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* into this ColorSpace.
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*
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* @exception ArrayIndexOutOfBoundsException If array length is not at
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* least 3.
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*/
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public float[] fromRGB(float[] rgbvalue)
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{
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return converter.fromRGB(rgbvalue);
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}
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/**
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* Transforms a color value assumed to be in this ColorSpace into the
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* CS_CIEXYZ conversion color space.
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*
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* @exception ArrayIndexOutOfBoundsException If array length is not at
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* least the number of components in this ColorSpace.
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*/
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public float[] toCIEXYZ(float[] colorvalue)
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{
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return converter.toCIEXYZ(colorvalue);
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}
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/**
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* Transforms a color value assumed to be in the CS_CIEXYZ conversion color
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* space into this ColorSpace.
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*
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* @exception ArrayIndexOutOfBoundsException If array length is not at
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* least 3.
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*/
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public float[] fromCIEXYZ(float[] colorvalue)
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{
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return converter.fromCIEXYZ(colorvalue);
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}
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public boolean isCS_sRGB()
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{
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return converter instanceof SrgbConverter;
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}
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/**
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* Returns the minimum normalized color component value for the specified
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* component.
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*
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* @exception IllegalArgumentException If component is less than 0 or greater
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* than numComponents - 1.
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*
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* @since 1.4
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*/
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public float getMinValue(int idx)
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{
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// FIXME: Not 100% certain of this.
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if (type == ColorSpace.TYPE_Lab && (idx == 1 || idx == 2))
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return -128f;
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if (idx < 0 || idx >= nComponents)
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throw new IllegalArgumentException();
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return 0;
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}
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/**
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* Returns the maximum normalized color component value for the specified
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* component.
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*
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* @exception IllegalArgumentException If component is less than 0 or greater
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* than numComponents - 1.
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*
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* @since 1.4
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*/
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public float getMaxValue(int idx)
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{
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if (type == ColorSpace.TYPE_XYZ && idx >= 0 && idx <= 2)
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return 1 + 32767 / 32768f;
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else if (type == ColorSpace.TYPE_Lab)
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{
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if (idx == 0)
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return 100;
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if (idx == 1 || idx == 2)
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return 127;
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}
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if (idx < 0 || idx >= nComponents)
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throw new IllegalArgumentException();
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return 1;
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}
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/**
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* Returns a colorspace converter suitable for a given profile
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*/
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private ColorSpaceConverter getConverter(ICC_Profile profile)
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{
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ColorSpaceConverter converter;
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switch (profile.isPredefined())
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{
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case CS_sRGB:
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converter = new SrgbConverter();
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break;
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case CS_CIEXYZ:
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converter = new CieXyzConverter();
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break;
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case CS_GRAY:
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converter = new GrayScaleConverter();
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break;
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case CS_LINEAR_RGB:
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converter = new LinearRGBConverter();
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break;
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case CS_PYCC:
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converter = new PyccConverter();
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break;
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default:
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if (profile instanceof ICC_ProfileRGB)
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converter = new RgbProfileConverter((ICC_ProfileRGB) profile);
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else if (profile instanceof ICC_ProfileGray)
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converter = new GrayProfileConverter((ICC_ProfileGray) profile);
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else
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converter = new ClutProfileConverter(profile);
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break;
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}
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return converter;
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}
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/**
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* Serialization compatibility requires these variable to be set,
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* although we don't use them. Perhaps we should?
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*/
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private void makeArrays()
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{
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minVal = new float[nComponents];
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maxVal = new float[nComponents];
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invDiffMinMax = diffMinMax = null;
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for (int i = 0; i < nComponents; i++)
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{
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minVal[i] = getMinValue(i);
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maxVal[i] = getMaxValue(i);
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}
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needScaleInit = true;
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}
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/**
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* Deserializes the object
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*/
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private void readObject(ObjectInputStream s)
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throws IOException, ClassNotFoundException
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{
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s.defaultReadObject();
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// set up objects
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converter = getConverter(thisProfile);
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nComponents = thisProfile.getNumComponents();
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type = thisProfile.getColorSpaceType();
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}
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} // class ICC_ColorSpace
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